C program to check whether a character is uppercase or lowercase

Write a C program to check whether a character is uppercase or lowercase.

  #include <stdio.h>

  int main() {
        int ch;
        printf("Enter your input character:");
        ch = getchar();

        /* checking whether input character is uppercase */
        if (ch >= 'A' && ch <= 'Z') {
                printf("%c is an uppercase character\n", ch);
        } else if (ch >= 'a' && ch <= 'z') {
                /* input character is lowercase */
                printf("%c is a lowercase character\n", ch);
        } else {
                /* input character is not an alphabet */
                printf("%c is not an alphabet\n", ch);
        }

        return 0;
  }

  Output:

  jp@jp-VirtualBox:~/$ ./a.out
  Enter your input character:Z
  Z is an uppercase character

  jp@jp-VirtualBox:~/$ ./a.out
  Enter your input character:3
  3 is not an alphabet

  jp@jp-VirtualBox:~/$ ./a.out
  Enter your input character:a
  a is a lowercase character